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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .page{
            margin: 40px;
            width: 400px;
            height: 500px;
            box-shadow: 0 0 0 2px #fff, 5px 5px 16px rgba(0, 0, 0, 0.2),
            inset 0 -40px 40px rgba(0, 0, 0, 0.2);
        }
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<body>
    <div class="page"></div>
</body>
</html>